Science Class 10 mcq

CBSE 10th Science Board Exam 2021 : Important MCQs from Chapter 13 Magnetic Effects of Electric Current

Syllabus for 2020-21 

Magnetic effects of current: Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Electric Motor, Electromagnetic induction. Induced potential difference, Induced current. Fleming’s Right Hand Rule.

                    MCQs

Q1. A current carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:

(a) From top to bottom

(b) From left to right

(c) From bottom to top

(d) From right to left

Answer: (a) From top to bottom

Q2. An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on:

(a) The speed with which the magnet is moved

(b) The number of turns of the coil

(c) The resistivity of the wire of the coil

(d) The strength of the magnet

Answer: (c) The resistivity of the wire of the coil

Q3. A positive charge is moving towards a person. The direction of magnetic field lines will be in

(a) Clockwise direction

(b) Anticlockwise direction

(c) Vertically upward direction

(d) Vertically downward direction

Answer: (b) Anticlockwise direction

Q4.  In all the electrical appliances, the switches are put in the

a. live wire

b. earth wire

c. neutral wire

d. all of above

Answer a

Q5. What is the condition of an electromagnetic induction?

  a. there must be a         relative   motion between the coil of wire and galvanometer

   b. there must be a relative motion between the galvanometer and a magnet

c. there must be a relative motion between galvanometer and generator

d. there must be a relative motion between the coil of wire and a magnet

Answer d